Bought 2 units for our front bedrooms as we are on a loud main highway. Installed them yesterday and the main difference in noise is wonderful. I went for your six.4mm laminated glass and positioned the units to the entrance with the window sill to give optimum gap. You’ll also https://louistqkdu.59bloggers.com/27239496/detailed-notes-on-secondary-glazing-vs-double-glazing